Images of trabecular bone head in osteoporotic women under SEM. A. The middle part of trabecular bone was easy to penetrate and break as severe resorption activity occurred there. (×100). B. Resorption lacuna with paralleling collagen fibrils with broken fibrils on the bottom of it. (×3000). C. Newly generated collagen fibrils laying on the bottom of the lacuna in an ordered configuration. (×3000). D. Granular bone tissues with different heights surround the lacuna. (×3000).